我必須處理來(lái)自 API（在我的 Windows 應(yīng)用程序中）的 JSON 數(shù)據(jù)，并且我正在嘗試使用 WebClient.UploadString(); 發(fā)出 POST 請(qǐng)求；下面是我的代碼，但它拋出錯(cuò)誤，我嘗試了各種選項(xiàng)，但無(wú)法將 JSON 復(fù)制為字符串。string result = "";        string url = "https://30prnabicq-dsn.algolia.net/1/indexes/*/queries?x-algolia-agent=Algolia for vanilla JavaScript (lite) 3.24.12;JS Helper 2.24.0;vue-instantsearch 1.5.0&x-algolia-application-id=30PRNABICQ&x-algolia-api-key=dcccebe87b846b64f545bf63f989c2b1";        string json = "{\"requests\":[{\"indexName\":\"vacatures\",\"params\":\"query=&hitsPerPage=20&page=0&highlightPreTag=__ais-highlight__&highlightPostTag=__/ais-highlight__&facets=[\"category\",\"contract\",\"experienceNeeded\",\"region\"]&tagFilters=\"}]}";        using (var client = new WebClient())        {            client.Headers[HttpRequestHeader.Host] = "30prnabicq-dsn.algolia.net";            client.Headers[HttpRequestHeader.UserAgent] = "Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0";             client.Headers[HttpRequestHeader.Accept] = "application/json";             client.Headers[HttpRequestHeader.AcceptLanguage] = "en-US,en;q=0.5";             client.Headers[HttpRequestHeader.AcceptEncoding] = "gzip, deflate, br";             client.Headers[HttpRequestHeader.Referer] = "https://bouwjobs.be/";            client.Headers[HttpRequestHeader.ContentType] = "application/json";             client.Headers[HttpRequestHeader.ContentLength] = "249";             client.Headers[HttpRequestHeader.Origin] = "https://bouwjobs.be";             client.Headers[HttpRequestHeader.Connection] = "keep-alive";            client.Headers[HttpRequestHeader.Cache - Control] = "max-age=0";            result = client.UploadString(url, "POST", json);            return result;        }請(qǐng)指導(dǎo)我更正我的代碼。注意 - 我在我的代碼中包含了一些受限制的標(biāo)頭，但即使在注釋掉這些標(biāo)頭之后它也會(huì)拋出錯(cuò)誤。